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Re: Lagrange Multipliers
1. and 2. of your system are incorrect. The left hand side is correct, but the right hand side is wrong. What is the derivative of (x-1)^2 with respect to x? Ditto (y-1)^2 w.r.t. y. You might try fully expanding the expression and then deriving it if you're still getting 2x and 2y.
Hint: The chain rule always applies in derivatives, everywhere, all the time.
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